.preloader {
    position: fixed;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    background: #d5dffd;
    z-index: 999999999;
}
.loader {
    position: absolute;
    top: 35%;
    left: 40vw;
}
@media only screen and (min-width: 992px) {
     .loader {
        left: 40vw;
    }

}